GENERAL OPERATING INSTRUCTIONS
E lectrical power for the computer is controlled by two toggle switches marked FILAMENT and
HIGH VOLTAGE, with green and clear pilot lamps, respectively. These switches are w ired so
that the filaments may be on with the high voltage off, but the high voltage will not be on unless
the filament switch is in the ON position. Thus the filaments may be left on when the computer
is not in actual use, doing away with the warming-up time otherwise n ecessary. The filaments
should be turned on several minutes (preferably at least one-half hour) before use and should
then be left on unless the computer is to be idle for a period of several hours or longer.
To adjust the am plifier power supply output, the METER FUNCTION switch is set to SET B+.
The OPERATION switch should be in the RESET position. With the HIGH VOLTAGE switch ON,
turn the control VC on the chassis (near the rear) until the meter pointer rests at the red mark
labeled SET B+. This sets the output of the am plifier power supply to +300 volts.
Leaving the OPERATION switch in the RESET position, set the METER RANGE switch to 100 V
and the METER FUNCTION switch to AMPLIFIER BALANCE. Starting with am plifier 1, p ress
downward the slide switch immediately below the am plifier term inals on the panel and, using a
screw driver, turn the AMPLIFIER BALANCE CONTROL until the m eter pointer reads zero.
Repeat this operation for each of the other eight am plifiers. With the METER RANGE switch
set at 10 V, repeat the above operation for each am plifier. Once again, repeat the above op era
tion for each am plifier with the METER RANGE switch set at 1 V. The am plifiers should be
checked for balance before each problem run. It is not n ecessary to rem ove computing com po
nents from the problem board when balancing am plifiers as the slide switch on the panel d is
connects the am plifier from the problem board, as shown in Figure 15.
TO P R O B L E M BOARD
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Figure 15
AMPLIFIER BALANCE CIRCUIT
Two binding posts above and to the right of the m eter provide for external use of the m eter.
With the METER FUNCTION switch in INPUT position, the meter is disconnected from the
computer and connected to the two binding posts labeled METER INPUT. The m eter may then
be used to measure voltages of 100 or le ss applied to the METER INPUT binding posts. The
METER RANGE switch is used to select the proper range. The m eter has a sensitivity of
10,000 ohms per volt.
The AM PLIFIER OUTPUT binding posts above and to the left of the m eter provide for external
read-out, such as with an oscillo sco p e or pen re co rd e r. By turning the METER FUNCTION switch
to any of the positions 1 through 9, the output of the corresponding am plifier may be read on the
m eter or taken off at the term inals marked AMPLIFIER OUTPUT. If desired, the METER
RANGE switch may be set to OFF, thus disconnecting the meter from the output circuit and
using only the binding posts. The AMPLIFIER OUTPUT term inals are automatically disconnected
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